Starting Out With C++: Early Objects (10th Edition)
10th Edition
ISBN: 9780135235003
Author: Tony Gaddis, Judy Walters, Godfrey Muganda
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 1RQE
A class that cannot be instantiated is a(n) _____ .
Expert Solution & Answer
Program Description Answer
The classes which cannot be instantiated are referred as “abstract base class”.
Explanation of Solution
Inheritance:
Inheritance is the concept of inheriting the members and properties of a base class from the derived class. The main advantages of inheritance are,
- Code reusability and fast implementation.
- Reduces the program code.
Abstract base class:
Abstract base class is a class which contains at least one pure virtual function.
- Compiler will not permit the user to instantiate an abstract class.
- Normally, in function the base class contains the implementation and the derived class overrides this implementation with its own implementation.
- But, the class which inherits an abstract base class must provide definition to the pure virtual function.
- The pure virtual functions implementation is not provided, and the function can be made pure virtual by adding (= 0) at the end of the function.
- The pure virtual function is mostly implemented in the derived class and not in a base class.
Example for abstract base class with virtual function:
/*Abstract base class as it uses virtual function*/
class Base
{
/*Access specifier*/
public:
/*virtual function*/
virtual void disp() = 0
};
/*Virtual function definition*/
void Base::disp()
{
//statement;
}
Explanation:
In the above example,
- Define the abstract base class with the name of “Base”.
- Declare the pure virtual function with the name of “disp()” to make the class as the abstract class.
- The implementation of pure virtual function “disp()” is not provided in base class. But, it is given outside of the class definition.
- Hence, the abstract base class “Base” cannot be instantiated.
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Chapter 15 Solutions
Starting Out With C++: Early Objects (10th Edition)
Ch. 15.3 - Prob. 15.1CPCh. 15.3 - Prob. 15.2CPCh. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - How can you tell from looking at a class...Ch. 15.3 - What makes an abstract class different from other...Ch. 15.3 - Examine the following classes. The table lists the...Ch. 15 - A class that cannot be instantiated is a(n) _____...
Ch. 15 - A member function of a class that is not...Ch. 15 - A class with at least one pure virtual member...Ch. 15 - In order to use dynamic binding, a member function...Ch. 15 - Static binding takes place at _____ time.Ch. 15 - Prob. 6RQECh. 15 - Prob. 7RQECh. 15 - Prob. 8RQECh. 15 - The is-a relation between classes is best...Ch. 15 - The has-a relation between classes is best...Ch. 15 - If every C1 class object can be used as a C2 class...Ch. 15 - A collection of abstract classes defining an...Ch. 15 - The keyword _____ prevents a virtual member...Ch. 15 - To have the compiler check that a virtual member...Ch. 15 - C++ Language Elements Suppose that the classes Dog...Ch. 15 - Will the statement pAnimal = new Cat; compile?Ch. 15 - Will the statement pCreature = new Dog ; compile?Ch. 15 - Will the statement pCat = new Animal; compile?Ch. 15 - Rewrite the following two statements to get them...Ch. 15 - Prob. 20RQECh. 15 - Find all errors in the following fragment of code,...Ch. 15 - Soft Skills 22. Suppose that you need to have a...Ch. 15 - Prob. 1PCCh. 15 - Prob. 2PCCh. 15 - Sequence Sum A sequence of integers such as 1, 3,...Ch. 15 - Prob. 4PCCh. 15 - File Filter A file filter reads an input file,...Ch. 15 - Prob. 6PCCh. 15 - Bumper Shapes Write a program that creates two...Ch. 15 - Bow Tie In Tying It All Together, we defined a...
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